Machine element.



M. D. BALDWIN.

MACHINE ELEMENT.

APPLIOAITION FILED JUNE 15, 1912.

Patented Oct. 14, 1913.

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MELVIN I). BALDXVIN, 0F GRAND RAPIDS, MICHIGAN.

MACHINE ELEMENT.

Specification of Letters Patent.

Patented Oct. 14, 1913.

Application filed June 15, 1912. Serial No. 703,886.

To all whom/2'13 may concern:

Be it known that I, MELVIN D. BALDWIN, a citizen of the United States of America, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Machine Elements; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appert-ains to make and use the same.

My invention relates to improvements in machine elements, and more particularly to knife grinding machines and the like, and its object is to provide means for clamping the tilting table to which the knife is attached at any desired angle of adjustment, to provide means whereby this angle may be accurately determined, and to provide the device with various new and useful features hereinafter more fully described and particularly pointed out in the claim, reference being had to the accompanying drawings, in which:

Figure 1 is an elevation of one end of the tilting table of a knife grinding machine with my newly invented clamping means applied thereto; Fig. 2 is an elevation of the other end of the table showing the pivotal support thereof; Fig. 3 an end view of the device as shown in Fig. 1 and Fig. 4f an end elevation partially in vertical section on the line H of Fig. 1.

Like numbers refer to like parts in all of the figures.

1 represents the table of a knife grinding machine to which the knife blade is attached in any convenient way, bolts 2 being shown. This table is so arranged with relation to the grinding wheel that the knife which is clamped upon it may be brought into engagement with the said wheel to be sharpened. It is necessary to tilt the table 1 to give the desired bevel to the edge of the knife blade and for this purpose the table is mounted on trunnions 3 which are supported in bearings 4E mounted on the carriage of the machine. One of these bearings is split and provided with a clamping bolt 5 which is capable of drawing the split portions of the bearing tightly about the trunnion 3 to clamp the table after it has been adjusted to the desired angle.

A hand lever 6 is attached to the upper end of the clamping bolt 5 for the purpose of manually operating the same. A. hand wheel 7 is attached to the outer end of the trunnion 3 and a handle 8 projects from the rim of this wheel for the purpose of rotating the table.

A graduated arcshaped dial 9 is attached to one end of the table concentric with the axis of the trunnion and the graduations on the dial are preferably divided and marked to correspond with the degrees of a portion of a circle. An index 10 is attached to the upper side of the adjacent bearing and preferably extends directly upward and is so arranged that when the surface of the table is horizontal the pointer will stand opposite the Zero mark on the dial and indicates any inclination of the table in either direction from the horizontal on the dial.

The trunnion bearing on the'opposite end of the table may be of any desired form the one shown being split and provided with a bolt to take up any lost motion and compensate for any wear that may occur in the bearing but is not intended to serve as a clamping means the table being clamped and held in adjusted position entirely at the opposite end by the means above described.

No other portion of the machine on which this device is mounted is shown in the accompanying drawings, as it will be obvious that this device may be applied to any knife grinding or similar machine in which a tilting table is used and where it is desirous of being able to determine the exact angle to which the table is tilted.

What I claim is A machine element of the class described, comprising a tilting table mounted on trunnions, a split bearing for one of the said trunnions, a clamping bolt in said bearing to clamp the split bearing upon the trunnion, a hand lever attached to the clamping bolt, a hand wheel fixed to the trunnion, an arc-shaped graduated dial attached to one end of the table concentric with its axis, an index mounted on a trunnion bearing adjacent to the dial to indicate the angle to which the table is tilted.

In testimony whereof I aliix my signature in presence of two witnesses.

MELVIN D. BALDWIN.

Witnesses:

HAROLD O. VAN An'rwnnr, LUTHER V. MOULTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

